Poison ivy isn't poisonous -- it causes an allergic reaction that can take days to appear. Learn about poison ivy and how to avoid it in today's episode of BrainStuff, based on this article: https://science.howstuffworks.com/life/botany/poison-ivy.htm/printable

What Do A.M., P.M., and SOS Stand For?
09:18

How Do Fainting Goats Work?
09:04

Does Smog Make Sunsets More Beautiful?
08:23